A game about forced loneliness, made by TACStudios
tacstudios.tngl.sh
1using System.Collections;
2using System.Collections.Generic;
3using Unity.Mathematics;
4using UnityEngine;
5
6namespace UnityEngine.Rendering
7{
8 // All this is just a copy of C++ LODGroupManager code.
9 internal static class LODGroupRenderingUtils
10 {
11 public static float CalculateFOVHalfAngle(float fieldOfView)
12 {
13 return Mathf.Tan(Mathf.Deg2Rad * fieldOfView * 0.5f);
14 }
15
16 public static float CalculateScreenRelativeMetric(LODParameters lodParams, float lodBias)
17 {
18 float screenRelativeMetric;
19 if (lodParams.isOrthographic)
20 {
21 screenRelativeMetric = 2.0F * lodParams.orthoSize;
22 }
23 else
24 {
25 // Half angle at 90 degrees is 1.0 (So we skip halfAngle / 1.0 calculation)
26 float halfAngle = CalculateFOVHalfAngle(lodParams.fieldOfView);
27 screenRelativeMetric = 2.0f * halfAngle;
28 }
29
30 return screenRelativeMetric / lodBias;
31 }
32
33 public static float CalculatePerspectiveDistance(Vector3 objPosition, Vector3 camPosition, float sqrScreenRelativeMetric)
34 {
35 return Mathf.Sqrt(CalculateSqrPerspectiveDistance(objPosition, camPosition, sqrScreenRelativeMetric));
36 }
37
38 public static float CalculateSqrPerspectiveDistance(Vector3 objPosition, Vector3 camPosition, float sqrScreenRelativeMetric)
39 {
40 return (objPosition - camPosition).sqrMagnitude * sqrScreenRelativeMetric;
41 }
42
43 public static Vector3 GetWorldReferencePoint(this LODGroup lodGroup)
44 {
45 return lodGroup.transform.TransformPoint(lodGroup.localReferencePoint);
46 }
47
48 public static float GetWorldSpaceScale(this LODGroup lodGroup)
49 {
50 Vector3 scale = lodGroup.transform.lossyScale;
51 float largestAxis = Mathf.Abs(scale.x);
52 largestAxis = Mathf.Max(largestAxis, Mathf.Abs(scale.y));
53 largestAxis = Mathf.Max(largestAxis, Mathf.Abs(scale.z));
54 return largestAxis;
55 }
56
57 public static float GetWorldSpaceSize(this LODGroup lodGroup)
58 {
59 return lodGroup.GetWorldSpaceScale() * lodGroup.size;
60 }
61
62 public static float CalculateLODDistance(float relativeScreenHeight, float size)
63 {
64 return size / relativeScreenHeight;
65 }
66 }
67}